assertion  retraction  graph  subject     predicate        object      datatype    annotation
1          0           graph  DOID:13476  oio:id           DOID:13476  xsd:string  
1          0           graph  DOID:7763   rdfs:subClassOf  DOID:13476  _IRI        
1          0           graph  DOID:8133   rdfs:subClassOf  DOID:13476  _IRI